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Possible Solutions for Spam

"None of these do me any good with my current setup, but they
all have something in common: they filter the bulk of the email as
early as possible at the receiving server. This should be more
widely available.

"I'd like to see an open source project to build a reliable
email pre-filter along the lines of Ronald's. Ideally, it could
either run on the same box as an existing email server, or on a
separate box, depending on the volume of spam being filtered.
Ideally, it would have Linux, Windows, and Mac versions, and would
be easily monitored, updated and tuned..."